Water-tube boiler



Au 27, 1929. H..J. s. M KAY WATER TUBE BOILER Original Filed July 3, 1919 5 Sheets-Sheet Aug; 27, 1929. 5, MacKAY 1,726,112

WATER TUBE BOILER Original Filed July 1919 3 Sheets-Sheet 2 Patented Aug. 27, 1929.

UNITED STATES PATENT OFFICE.

HENRY JOHN SUTHERLAND MAGKAY, OF BYDE, ENGLAND, ASSIGNOR TO THE BAB- OOOK & WILCOX COMPANY, OF BAYONNE, NEW JERSEY, A CORPORATION OF NEW JERSEY.

WATER-TUBE BOILER.

Application filed July 3, 1919, Serial No. 308,615, and in Great Britain July 31, 1918. Renewed July as to supply only a portion of the rear bank,

say a central portion approximately equal to one half of the rear bank of tubes, and the lower or mud drum is fitted with an imperforate diaphragmseparating the whole of the rear bank from the front and intermediate banks of tubes.

The invention is illustrated in the accompanying drawing in which Fig. 11s a Ver tical section of a Stirling boiler fitted with the improvements. Fig. 2 is a rear view of the boiler showing the rear drum and feed trough and Fig. 3 a perspective View 1llustrating the water circulation, a number of tubes being omitted for the sake of clearness.

In the drawings a denotes the front, and Z)- the rear upper drum while 0 denotes the lower or mud drum. As shown, a feed trough (Z is arranged within the rear drum b of the boiler, the feed trough being enclosed by transverse partitions e and a longitudinal partition f so as to form a water tight compartment 9 from which the water from the feed trough can pass to the central tubes of the rear bank of tubes h. The compartment g is preferably dimensioned so as to supply a portion of the rear bank approximately equal to one half the width of the rear bank. In the lower or mud drum 0 40 is fitted an imperforate diaphragm i which separates the whole of the rear bank of tubes h from the intermediate bank is and the front bank of tubes Z.

With the arrangement provided the water supplied by the feed trough d to the central portion of the. rear bank It passes down the tubes h of this portion of the said bank into the lower drum 0 and by reason of the position of the imperforate diaphragm z passes so up those series of tubes 71 and 72 of the rear bank which are cut off from the feed compartment 9 into the rear upper drum 5, thence down into the lower through the tubes of the bank 70 in front of the imperforate diaphragm z and thence up the front bank Z to the front upper drum a. It will be noted that the gases from the furnace are directed into engagement with the rows of water tubes in a general direction indicated by the arrows, and in a direction generally transversely of the drums or water chambers. In the embodiment illustrated, a baffle atthe rear of the front bank of tubes extending upwardly from the lower drum, and a baflie extending downwardly compartment and return through the re;

maining tubes of the same rear bank, a greater proportion of the solid matter contained in the water is deposited from the rear bank of tubes which are subjected to the coolest gases, thereby causing a minimum amount of solid matter to be introduced into the interior of the boiler tubes which are acted uponby the hottest gases.

Heating the water as it flows downwardly in the tubes which connect the water compartment in the upper drum to the lower drum, causes the solids therein to precipitate. The water flows from these tubes intov a lower Water chamber in which there is a comparatively large pool, and in which the water in a heated condition flows longitudinally of the drum before it flows upwardly in the other tubes of the rear bank to the rear upper drum. The. flow of the water, therefore, in the lower water chamber is comparatively slow, thereby permitting deposit of the solids, which have been precipitated by the heating of the water.

What I claim is: I

1. In a boiler, front and rear up per drums connected by water tubes, 9. loweif Fir 1 1m canned/a1 to; {teeth upper bank being connected to said compartment and the remainder to said rear upper drum outside of said compartment, the lower drum being divided by a longitudinally extending imperforate diaphragm into two lower compartments, to one of which the,

tubes of said bank are connected, a circulatory system comprising the other lower compartment and the portion of the rear upper drum outside of said upper compartment, and means for passing gases over said circulatory system and then over said rear bank, the gases passing over all of the tubes of said bank in the same general direction.-

2. In a steam boiler, front and rear upper drums connected by water tubes, a lower drum connected to the front upper drum. by a bank of tubes and to the rear upper drum by two banks of tubes, a battle extending transversely of the boiler and extending downwardly from said rear drum between the two said banks of tubes to define a front bank and a. rear bank, the rear upper drum being provided with an upper compartment shorter than the associated drum to which compartment the feed water is introduced, part of the tubes of the rear bank being connected to said compartment and the remainder to said rear upper drum outside of said compartment, the lower drum being divided by a longitudinally extending imperforate diaphragm into two lower compartments, to one of which the tubes of said bank are connected, a circulatory system comprising the other lower compartment and the portion of the rear upper drum outside of said upper compartment, and means for passing gases over said circulatory system and then over all of the tubes of said rear bank in the same general direction and in a direction opposite to the flow of water from said compartment in the rear upper drum to the lower drum.

3. In a steam boiler, an upper steam and water drum and a lower drum connected by rows of water tubes, the upper drum being provided with a compartment to which feed water is introduced, said compartment being shorter than the associated drum, the lower drum being providedwith a battle at least one edge of which is seated against said drum, part of the tubes connecting said drums being connected at their upper ends to said compartment and at their lower ends "lower drum at one side of said bafiie and thence upwardly through other tubes connected to the lower drum at the same side of said battle to the upper steam and water drum, and a circulatory system including the other compartment of said lower drum.

4. In a steam boiler, an upper steam and water drum and a lower drum connected by water tubes, the upper drum being provided with a compartment to which feed water is introduced, the lower drum being provided with a battle at least one edge of which is seated against said drum, a first part of the tubes connecting said drums being connected at their upper ends to said compartment and at their lower ends to said lower drum at one side of said battle, a second part 01 said tubes being connected to the lower drum at the same side of said bafiie as the first part of the tubes and to the upper drum outside of said compartment, the second part of said tubes being longitudinally displaced along the drum from said first part of the tubes, means for feeding water to said upper compartment, and a circulatory sys tem including the other compartment of said lower drum.

5. In a steam boiler, an upper steam and 7 water drum and a lower drum connected by rows of water tubes, the upper drum being provided with a compartment to which feed water is introduced, said compartment being shorter than the associated drum, the lower drum being provided with a longitudinally extending imperforate partition dividing it into two compartments, a row of tubes connecting the compartment in said upper drum to one of the compartments of the lower drum, the remaining tubes of said row being connected to the last mentioned compartment of the lowerdrum and to said upper drum outside of said compartment, other tubes connected to the other compartment of the lower drum and to the upper drum outside of its compartment, a. circulatory system comprising the last mentioned tubes, and means for feeding water to said upper compartment.

6. In a steam boiler, two upper steam and water drums, a lower mud drum, the upper drum being provided with a compartment to which feed water is introduced, said compartment being shorter than its drum, the,

lower mud drum being provided with a longitudinally extending partition dividing said drum into a first and a second compartment, a row of tubes the upper ends of some of which communicate with said compartment in the upper drum and the remaining tubes ofwhich communicate with said drum outside of said compartment, all of the tubes of said row being connected at their lower ends to the first of said compartments in the lower drum, a bank of tubes connecting the second compartment of the lower drum to the upper ,drum outside of its compartment, tubes connecting the second compartment of the lower drum to the other upper drum, and circulating tubes connecting the two upper drums.

7. In a steam boiler, a front and a rear upper steam and water drum, a lower drum, banks of tubes connecting said drums and forming a circulatory system, an additional bank of tubes connecting the lower drum and the rear upper drum, and means for causing feed Water to flow first downward through some of the tubes of said additional bank and upward through the remaining tubes thereof into said circulatory system, said means comprising a compartment in the rear upper drum in communication with the down-flow tubes only of said additional bank, said compartment being of less length than said rear upper drum.

8. In a steam boiler, a front and a rear upper steam and water drum, a lower drum, banks of tubes connecting said drums and forming a circulatory system, an additional bank of tubes connecting the lower drum and the rear upper drum, and means for causing feed water to flow first downward through the middle tubes of said additional bank and, upward through the end tubes thereof into said circulatory system, said means comprising a compartment in the rear upper drum in communication with the down-flow tubes only of said additional bank, said compartment being of less length than said rear upper drum.

In testimony whereof I have signed my name to this specification.

HENRY JOHN SUTHERLAND MacKAY. 

